@TP-Link I have a PC directly connected on M4 lan port and it works perfectly. If I connect all my devices on M4 WiFi, they don't work: the speed is slow.

@TP-Link Hi, I live in Italy and I own n. 4 Deco M4. My internet provider guarantees me a 1Gb bandwidth and, if I connect directly to the modem (both in WiFi and in Eth), I can reach speeds of 940...